POP – Free European electronic invoicing for e-commerce (ex-WooPop)

POP is the complete e-invoicing plugin for WooCommerce, Paid Memberships Pro and Cozmos PMS, designed for full compliance with European electronic invoicing standards. It supports structured XML invoice generation, automated delivery and certified archiving, giving your e-commerce a seamless and reliable invoicing workflow. POP currently supports Italy, San Marino, Spain and Belgium, and it is built to align with national and EU e-invoicing requirements as they evolve across Europe. POP automates the entire process: electronic invoice generation, XML file creation, submission to national or international interchange systems, and long-term digital preservation of fiscal documents. It supports XML e-invoices, PDF e-invoices, credit notes and fiscal receipts, ensuring alignment with EU e-invoicing and structured invoicing practices. With the latest update, POP includes direct delivery to the Italian Exchange System (SdI) and full support for Belgian structured e-invoicing, where B2B e-invoicing becomes mandatory for VAT-registered businesses starting January 1st, 2026.

International PEPPOL Support (NL, FR, DE, UK)

POP enables sending structured XML e-invoices to customers in the Netherlands, France, Germany and the United Kingdom through the PEPPOL International network, using a certified Access Point.

Unlike Belgium, these countries do not require mandatory B2B e-invoicing, but many businesses still request PEPPOL delivery for interoperability or internal compliance. POP provides the technical capability to route invoices internationally. Regulatory requirements may vary by jurisdiction, and users should verify their own obligations.

POP is also available for Shopify: apps.shopify.com/pop-european-invoicing

What can POP do for you?

POP is available in four plans (Free, Growth, Pro and Enterprise). For paid features, visit: https://popapi.io/en/prices/. Below are the features included in the Free plan.

Document Generation & Delivery

• Automatic generation of XML electronic invoices and PDFs for all completed orders
• Up to 20 fiscal documents per month included in the free plan
• Manual download of invoices in PDF or XML format
• Local storage of XML files
• Customizable PDF templates with logo and footer text
• Fully compatible with EU e-invoicing workflows

Tax Management

• Support for customers in the European Union and worldwide
• Configuration of tax regimes and VAT treatments
• Regulatory references for exempt transactions

Verification and Data Control

• Automated validation of VAT number and Tax Code via the European VIES system
• Customizable invoicing fields: VAT number, Tax Code, Destination Code and more

Document Numbering and Configuration

• Fully customizable invoice numbering (prefix, suffix, yearly reset)
• Progressive numbering for invoices, credit notes and receipts
• Automatic blocking of invoices with a zero total
• Exclusion of zero-value line items from invoices

Management and Reporting

• Filters for invoices by date, type and WooCommerce order status
• Search by invoice number or order ID
• Full integration with WooCommerce e-invoicing
• No installation limits or restrictions with other CMS or management systems

POP API and Integrations

POP includes all integrations previously offered as paid add-ons – such as automatic interchange system submission, qualified electronic signature and certified digital preservation – now built directly into the plugin depending on your selected plan. Thanks to these built-in capabilities, POP works as a complete invoice generation plugin, automating XML creation, signing, transmission and long-term preservation through a fully structured, compliant e-invoicing workflow.

Invoice Options

With POP you can customize your invoicing workflow by configuring:

• Invoice prefix and suffix
• Automatic progressive numbering
• Custom fields (Tax Code, Destination Code and more)
• Automatic sending of PDF invoices via email
• HTML invoice display

Supported Payment Methods

• Cash
• Bank Transfer
• Check
• Payment Cards
• SEPA Direct Debit

Compatibility

POP is compatible with the latest versions of WordPress and WooCommerce: * WooCommerce: up to version 9.x.x (HPOS-compatible) * PHP: 5.6 or higher * WordPress: 4.6 or higher

We recommend using WordPress 6.x.x and WooCommerce 9.x.x for optimal performance. We understand how frustrating it can be to navigate complex tax regulations, cumbersome tools, and the fear of making costly mistakes. We’ve been there too. It is precisely from these daily challenges that POP was born: a practical solution to real problems. We didn’t want just another software. We wanted a simple, immediate, and truly useful solution. A way to automate tax management, reduce time wastage, and make room for the growth of your business, without the burden of bureaucracy. POP is born from direct experience. It is designed to be clear, reliable, and perfectly integrated into your daily workflow. We can’t make compliance sexy, only easier.

Contributions

« POP – European electronic invoicing for e-commerce (ex-WooPop) » is open source software. Contribute to its development to continuously improve the plugin!

F.A.Q.

Is the POP plugin free?

Yes, POP offers a free version which includes 20 API credits per month. One API credit allows you to generate a fiscal document. To have more credits available and access advanced features, it is necessary to activate a paid plan.

Can I automatically send invoices to tax authorities?

Yes, with the Growth plan you can integrate POP with the italian tax authorities system, automating the sending of electronic invoices directly from your e-commerce.

Is it possible to customize invoices generated with POP?

Certainly! You can customize the PDF invoice template by adding your company logo and custom footer text. Furthermore, it is possible to configure invoice prefix, suffix, and progressive numbering.

Does POP support invoicing for foreign customers?

Yes, POP is designed to support tax management for customers within the European Union as well as worldwide sales, in compliance with current regulations.

Is it possible to generate Credit Notes with POP?

Yes, starting from the Growth plan, you can generate and manage Credit Notes in XML or PDF format directly from the plugin.

Does the plugin offer customer support?

Yes. For support requests, you can contact us directly via the support link in the plugin or open a ticket from our official website.

Requirements

PHP: >= 5.6 WordPress: >= 4.6